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Proapoptotic effect of control‐released basic fibroblast growth factor on skin wound healing in a diabetic mouse model
Author(s) -
Huang Chenyu,
Orbay Hakan,
Tobita Morikuni,
Miyamoto Masaaki,
Tabata Yasuhiko,
Hyakusoku Hiko,
Mizuno Hiroshi
Publication year - 2015
Publication title -
wound repair and regeneration
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.847
H-Index - 109
eISSN - 1524-475X
pISSN - 1067-1927
DOI - 10.1111/wrr.12375
Subject(s) - basic fibroblast growth factor , myofibroblast , wound healing , angiogenesis , fibroblast , tunel assay , immunohistochemistry , apoptosis , fibroblast growth factor , medicine , andrology , chemistry , growth factor , pathology , surgery , biochemistry , receptor , fibrosis , in vitro
The ability of basic fibroblast growth factor (bFGF) to improve wound healing is attenuated by its short half‐life in free form. This study aimed to enhance skin wound healing in a diabetes mouse model while concomitantly decreasing scar formation using control‐released bFGF together with acidic gelatin hydrogel microspheres (AGHMs). Bilateral full‐thickness wounds (10 mm in diameter) were made on the backs of db/db mice. Forty‐five mice were divided into three groups, and the base of the wound under the panniculus carnosus and the wound periphery were injected with phosphate‐buffered saline (300 μL) containing (1) control‐released bFGF (50 μg), (2) control‐released bFGF (20 μg), or (3) AGHMs alone. The size of the wound area was recorded on each postoperative day (POD). Mice were sacrificed on postoperative day 4, 7, 10, 14, and 28, and skin wound specimens were obtained to assess the endothelium/angiogenesis index via cluster of differentiation 31 immunohistochemistry, the proliferation index via Ki‐67 immunohistochemistry, and the myofibroblast and fibroblast apoptosis indices by terminal deoxynucleotidyl transferase‐mediated dUTP nick‐end labeling and alpha‐smooth muscle actin or vimentin staining, respectively. Epithelialization rates and indices of proliferation and myofibroblast/fibroblast apoptosis were higher in the bFGF groups than in the AGHM group, mainly within 2 weeks of injury. No dose‐effect relationship was found for control‐released bFGF, although the actions of 50 μg bFGF seemed to last longer than those of 20 μg bFGF. Therefore, control‐released bFGF may accelerate diabetic skin wound healing and induce myofibroblast/fibroblast apoptosis, thereby reducing scar formation.